/* =============================================
   CSS-переменные
   ============================================= */
:root {
  --color-bg:             #F7F9F4;
  --color-bg-alt:         #EEF2E8;
  --color-bg-card:        #FFFFFF;
  --color-primary:        #4A7C59;
  --color-primary-dark:   #3A6347;
  --color-primary-light:  #E8F0EA;
  --color-text:           #2D3B2D;
  --color-text-secondary: #6B7B6B;
  --color-border:         #D4DDD4;
  --color-accent:         #8FB996;

  --font-heading: 'Merriweather', Georgia, serif;
  --font-body:    'Source Sans 3', 'Segoe UI', Arial, sans-serif;

  --header-height: 64px;
  --container-width: 1100px;
  --radius-card: 12px;
  --shadow-card: 0 1px 3px rgba(0,0,0,0.04), 0 2px 8px rgba(0,0,0,0.06);
  --shadow-card-hover: 0 4px 14px rgba(74,124,89,0.12), 0 8px 24px rgba(0,0,0,0.09);
  --transition: all 0.25s ease;
}

/* =============================================
   Сброс и базовые стили
   ============================================= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: var(--transition);
}

a:hover { color: var(--color-primary-dark); }

ul { list-style: none; }

/* =============================================
   Типографика
   ============================================= */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  color: var(--color-text);
  line-height: 1.25;
}

h1 { font-size: 2rem; font-weight: 900; }
h2 { font-size: 1.75rem; font-weight: 700; }
h3 { font-size: 1.25rem; font-weight: 700; }
h4 { font-size: 1.05rem; font-weight: 700; }

p { margin-bottom: 0; }

.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: 0.75rem;
  color: var(--color-text);
  letter-spacing: -0.01em;
}

.section-intro {
  color: var(--color-text-secondary);
  font-size: 1rem;
  margin-bottom: 2rem;
  max-width: 700px;
}

/* =============================================
   Контейнер
   ============================================= */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* =============================================
   Шапка
   ============================================= */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: #fff;
  box-shadow: 0 1px 6px rgba(0,0,0,0.08);
  height: var(--header-height);
  transition: height 0.3s ease, box-shadow 0.3s ease;
}

.site-header.scrolled {
  height: 54px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.1);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.header-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-primary);
  flex-shrink: 0;
  cursor: pointer;
  transition: var(--transition);
}

.header-name:hover { color: var(--color-primary-dark); }

/* Навигация */
.nav-list {
  display: flex;
  gap: 0.25rem;
  align-items: center;
}

.nav-list a {
  display: block;
  padding: 0.35rem 0.7rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  border-radius: 6px;
  transition: var(--transition);
  white-space: nowrap;
}

.nav-list a:hover,
.nav-list a.active {
  color: var(--color-primary);
  background: var(--color-primary-light);
}

/* Бургер */
.burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
  transition: var(--transition);
}

.burger:hover { background: var(--color-primary-light); }

.burger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}

.burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.open span:nth-child(2) { opacity: 0; }
.burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =============================================
   Секции
   ============================================= */
.section {
  padding: 5rem 0;
  background: var(--color-bg);
}

.section-alt {
  background: var(--color-bg-alt);
}

/* Первая секция под шапкой */
.section-hero {
  padding-top: calc(var(--header-height) + 3rem);
  padding-bottom: 4rem;
  background: var(--color-bg);
}

/* =============================================
   Герой-блок
   ============================================= */
.hero-inner {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 3rem;
  align-items: center;
}

.hero-photo-wrap {
  flex-shrink: 0;
}

.hero-photo {
  width: 260px;
  height: auto;
  max-height: 380px;
  object-fit: contain;
  display: block;
  border-radius: 18px;
  box-shadow: 0 6px 28px rgba(74, 124, 89, 0.22), 0 2px 8px rgba(0,0,0,0.08);
  border: 3px solid rgba(255,255,255,0.9);
  outline: 2px solid var(--color-primary-light);
}

.hero-photo-placeholder {
  width: 260px;
  height: 300px;
  border-radius: 16px;
  background: var(--color-primary-light);
  border: 3px solid var(--color-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  gap: 0.5rem;
}

.hero-photo-placeholder svg {
  width: 56px;
  height: 56px;
  opacity: 0.6;
}

.hero-photo-placeholder span {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.hero-info {}

.hero-position {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.4rem;
}

.hero-name {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 900;
  margin-bottom: 0.25rem;
  line-height: 1.2;
}

.hero-school {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin-bottom: 1.25rem;
}

.hero-motto {
  margin-bottom: 2rem;
  padding: 0.9rem 1.2rem;
  border-left: 2px solid var(--color-primary);
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.hero-motto-text {
  font-size: 1rem;
  font-style: italic;
  color: var(--color-text);
  line-height: 1.7;
}

.hero-motto-author {
  font-size: 0.82rem;
  font-style: normal;
  color: var(--color-text-secondary);
  font-weight: 500;
  letter-spacing: 0.01em;
}

/* Бейджи */
.hero-badges {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
}

.badge {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.3rem;
  padding: 1rem 1.1rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  transition: transform 0.22s ease, box-shadow 0.22s ease;
}

.badge:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card-hover);
}

.badge-icon {
  width: 28px;
  height: 28px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.badge-label {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.badge-value {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.3;
}

/* =============================================
   Карточки
   ============================================= */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 1.5rem;
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card-hover);
}

.card-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  color: var(--color-text);
}

.card-meta {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-bottom: 0.5rem;
}

.card-description {
  font-size: 0.9rem;
  color: var(--color-text);
  line-height: 1.6;
}

/* =============================================
   Сетки карточек
   ============================================= */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.cards-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

/* =============================================
   Секция «Общие сведения»
   ============================================= */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.about-block {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
}

.about-block-title {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-primary);
  margin-bottom: 0.75rem;
}

.about-block p,
.about-block li {
  font-size: 0.95rem;
  color: var(--color-text);
  margin-bottom: 0.4rem;
}

.about-block ul {
  padding-left: 0;
}

.about-block ul li {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.about-block ul li::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
  flex-shrink: 0;
  margin-top: 0.55em;
}

.course-item {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--color-border);
}

.course-item:last-child { border-bottom: none; }

.course-name {
  font-weight: 600;
  font-size: 0.9rem;
}

.course-meta {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

.tag {
  display: inline-block;
  padding: 0.25rem 0.7rem;
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
}

/* =============================================
   Секция «Результаты»
   ============================================= */
.results-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.results-block-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.results-block-title svg {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
  flex-shrink: 0;
}

/* Таблица результатов */
.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

table th {
  background: var(--color-primary);
  color: #fff;
  padding: 0.6rem 0.9rem;
  text-align: left;
  font-weight: 600;
  font-family: var(--font-body);
}

table th:first-child { border-radius: 8px 0 0 0; }
table th:last-child  { border-radius: 0 8px 0 0; }

table td {
  padding: 0.6rem 0.9rem;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
}

table tr:last-child td { border-bottom: none; }
table tr:nth-child(even) td { background: var(--color-primary-light); }

/* Список олимпиад / наград */
.olympiad-item,
.award-item {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.olympiad-item:last-child,
.award-item:last-child { border-bottom: none; }

.olympiad-event { font-weight: 600; font-size: 0.9rem; }
.olympiad-result { color: var(--color-primary-dark); font-size: 0.9rem; }
.olympiad-year,
.award-issuer { color: var(--color-text-secondary); font-size: 0.82rem; }

.award-name { font-weight: 600; font-size: 0.9rem; }

/* =============================================
   Секция «Публикации»
   ============================================= */
.publication-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.publication-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}

.publication-title {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-text);
}

.publication-source {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.publication-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 0.5rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* =============================================
   Кнопки
   ============================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 1rem;
  border-radius: 7px;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: var(--font-body);
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  border: 2px solid transparent;
}

.btn-outline {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: transparent;
}

.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
}

.btn svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
}

/* =============================================
   Секция «ОГЭ/ЕГЭ/ВПР» — Табы
   ============================================= */
.tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.75rem;
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 0;
}

.tab-btn {
  padding: 0.55rem 1.4rem;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-body);
  color: var(--color-text-secondary);
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  border-radius: 6px 6px 0 0;
  transition: var(--transition);
}

.tab-btn:hover { color: var(--color-primary); }

.tab-btn.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
  background: var(--color-primary-light);
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.tab-description {
  font-size: 0.95rem;
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: 1.5rem;
  padding: 1rem 1.25rem;
  background: var(--color-primary-light);
  border-left: 3px solid var(--color-primary);
  border-radius: 0 8px 8px 0;
}

.materials-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.material-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1.25rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  flex-wrap: wrap;
}

.material-info {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.material-title { font-weight: 600; font-size: 0.9rem; }
.material-desc  { font-size: 0.82rem; color: var(--color-text-secondary); }

/* =============================================
   Секция «Исследовательские работы»
   ============================================= */
.research-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.research-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-card-hover);
}

.research-card-img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  display: block;
}

.research-card-body {
  padding: 1.25rem;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.research-card-title {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-text);
}

.research-card-student {
  font-size: 0.82rem;
  color: var(--color-primary-dark);
  font-weight: 600;
}

.research-card-desc {
  font-size: 0.88rem;
  color: var(--color-text);
  line-height: 1.55;
  flex: 1;
}

.research-card-result {
  margin-top: 0.5rem;
  padding: 0.4rem 0.75rem;
  background: var(--color-primary-light);
  border-radius: 6px;
  font-size: 0.82rem;
  color: var(--color-primary-dark);
  font-weight: 600;
}

.research-card-year {
  font-size: 0.78rem;
  color: var(--color-text-secondary);
}

/* =============================================
   Секция «Методические рекомендации»
   ============================================= */
.method-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.method-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}

.method-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.method-title { font-weight: 700; font-size: 0.95rem; }
.method-desc  { font-size: 0.88rem; color: var(--color-text-secondary); line-height: 1.5; }

/* Бейдж-тип */
.type-badge {
  display: inline-block;
  padding: 0.2rem 0.65rem;
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  flex-shrink: 0;
  line-height: 1.4;
}

/* =============================================
   Секция «Программы»
   ============================================= */
.program-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.program-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card-hover);
}

.program-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.program-title   { font-weight: 700; font-size: 0.95rem; }
.program-classes { font-size: 0.82rem; color: var(--color-text-secondary); }
.program-desc    { font-size: 0.88rem; color: var(--color-text); line-height: 1.5; }

/* =============================================
   Фотогалерея
   ============================================= */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.gallery-item {
  position: relative;
  border-radius: var(--radius-card);
  overflow: hidden;
  cursor: pointer;
  aspect-ratio: 4 / 3;
  background: var(--color-primary-light);
  box-shadow: var(--shadow-card);
  transition: var(--transition);
}

.gallery-item:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-card-hover);
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

.gallery-item:hover img {
  transform: scale(1.05);
}

.gallery-item-overlay {
  position: absolute;
  inset: 0;
  background: rgba(74, 124, 89, 0);
  transition: var(--transition);
  display: flex;
  align-items: flex-end;
}

.gallery-item:hover .gallery-item-overlay {
  background: rgba(74, 124, 89, 0.5);
}

.gallery-item-caption {
  color: #fff;
  font-size: 0.82rem;
  padding: 0.75rem;
  opacity: 0;
  transition: var(--transition);
  text-shadow: 0 1px 3px rgba(0,0,0,0.5);
  line-height: 1.4;
}

.gallery-item:hover .gallery-item-caption {
  opacity: 1;
}

/* =============================================
   Модальное окно
   ============================================= */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 200;
  align-items: center;
  justify-content: center;
}

.modal.open { display: flex; }

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.75);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  z-index: 1;
  background: #fff;
  border-radius: 16px;
  max-width: min(90vw, 800px);
  max-height: 90vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.modal-close {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  width: 36px;
  height: 36px;
  background: rgba(0,0,0,0.5);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  transition: var(--transition);
  z-index: 2;
}

.modal-close:hover { background: rgba(0,0,0,0.75); }
.modal-close svg { width: 18px; height: 18px; }

#modal-img {
  width: 100%;
  max-height: 70vh;
  object-fit: contain;
  display: block;
}

.modal-caption {
  padding: 0.9rem 1.25rem;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  text-align: center;
  border-top: 1px solid var(--color-border);
}

/* =============================================
   Секция «Контакты»
   ============================================= */
.contacts-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  max-width: 800px;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
}

.contact-icon {
  width: 40px;
  height: 40px;
  background: var(--color-primary-light);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--color-primary);
}

.contact-icon svg { width: 20px; height: 20px; }

.contact-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  margin-bottom: 0.2rem;
}

.contact-value {
  font-size: 0.95rem;
  color: var(--color-text);
  font-weight: 600;
}

.contact-value a {
  color: var(--color-primary);
}

.contact-value a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

/* =============================================
   Подвал
   ============================================= */
.site-footer {
  background: var(--color-text);
  color: rgba(255,255,255,0.6);
  padding: 1.5rem 0;
  font-size: 0.85rem;
  text-align: center;
}

/* =============================================
   Кнопка «Наверх»
   ============================================= */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 3px 12px rgba(74, 124, 89, 0.4);
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: var(--transition);
  z-index: 90;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
}

.back-to-top svg { width: 20px; height: 20px; }

/* =============================================
   Утилиты
   ============================================= */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}

.items-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* =============================================
   Адаптивность
   ============================================= */

/* Планшет */
@media (max-width: 1024px) {
  .hero-badges {
    grid-template-columns: repeat(2, 1fr);
  }

  .results-grid {
    grid-template-columns: 1fr;
  }

  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-grid {
    grid-template-columns: 1fr;
  }

  .contacts-inner {
    grid-template-columns: 1fr;
  }
}

/* Мобильный */
@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }

  /* Бургер */
  .burger { display: flex; }

  .main-nav {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: #fff;
    box-shadow: 0 4px 16px rgba(0,0,0,0.12);
    padding: 1rem 0;
    z-index: 99;
  }

  .main-nav.open { display: block; }

  .nav-list {
    flex-direction: column;
    gap: 0;
  }

  .nav-list a {
    padding: 0.75rem 1.5rem;
    border-radius: 0;
    font-size: 0.95rem;
  }

  /* Герой */
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }

  .hero-photo-wrap {
    display: flex;
    justify-content: center;
  }

  .hero-photo {
    width: 200px;
    height: auto;
    max-height: 300px;
  }

  .hero-photo-placeholder {
    width: 200px;
    height: 240px;
  }

  .hero-badges {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Секции */
  .section {
    padding: 3rem 0;
  }

  .section-hero {
    padding-top: calc(var(--header-height) + 2rem);
    padding-bottom: 3rem;
  }

  /* Результаты */
  .cards-grid-2 {
    grid-template-columns: 1fr;
  }

  /* Галерея */
  .gallery-grid {
    grid-template-columns: 1fr;
  }

  /* Контакты */
  .contacts-inner {
    grid-template-columns: 1fr;
  }

  /* Материалы */
  .material-item {
    flex-direction: column;
    align-items: flex-start;
  }

  /* Исследования */
  .cards-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero-badges {
    grid-template-columns: 1fr 1fr;
  }

  .tabs {
    overflow-x: auto;
    padding-bottom: 0;
  }

  .tab-btn {
    padding: 0.5rem 1rem;
    font-size: 0.88rem;
    white-space: nowrap;
  }
}

/* =============================================
   Анимации появления при скролле
   ============================================= */
.reveal-target {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.42s ease, transform 0.42s ease;
}

.reveal-target.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal-target {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* =============================================
   Стили для печати
   ============================================= */
@media print {
  .site-header,
  .back-to-top,
  .burger,
  .modal { display: none !important; }

  body {
    font-size: 12pt;
    color: #000;
  }

  .section,
  .section-alt {
    background: #fff !important;
    padding: 1.5rem 0;
    page-break-inside: avoid;
  }

  .hero-inner { grid-template-columns: 200px 1fr; }

  .hero-photo { width: 160px; height: 160px; }

  .card, .about-block, .publication-item,
  .method-item, .program-item, .research-card {
    box-shadow: none;
    border: 1px solid #ccc;
  }

  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #666;
  }

  .gallery-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}